We make sound by pushing air from our lungs
along our vocal cords (or vocal folds) that then
vibrate to make sound. We have muscles that
control the shape of the vocal folds, and thus
make them vibrate in different ways. The mouth,
tongue, and lips then further direct the air to
alter the sound. Your voice is a combination of
these three systems; the lungs pushing out air,
muscles changing the shape of the vocal folds, and
your mouth, tongue and lips changing shape.
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